debug: Remove catchsegv and libSegfault (BZ #14913)

Trapping SIGSEGV within the process is error-prone, adds security
issues, and modern analysis design tends to happen out of the
process (either by attaching a debugger or by post-mortem analysis).

The libSegfault also has some design problems, it uses non
async-signal-safe function (backtrace) on signal handler.

There are multiple alternatives if users do want to use similar
functionality, such as sigsegv gnulib module or libsegfault.

1 files changed, 0 insertions, 120 deletions

diff --git a/sysdeps/unix/sysv/linux/mips/register-dump.h b/sysdeps/unix/sysv/linux/mips/register-dump.h
deleted file mode 100644
index b3ada7b7bf..0000000000
--- a/sysdeps/unix/sysv/linux/mips/register-dump.h
+++ /dev/null
@@ -1,120 +0,0 @@
-/* Dump registers.
-   Copyright (C) 2000-2022 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library.  If not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#include <sgidefs.h>
-#include <sys/uio.h>
-#include <_itoa.h>
-
-#if _MIPS_SIM == _ABIO32
-# define CTX_TYPE	struct sigcontext *
-# define CTX_REG(ctx, i)	((ctx)->sc_regs[(i)])
-# define CTX_PC(ctx)	((ctx)->sc_pc)
-# define CTX_MDHI(ctx)	((ctx)->sc_mdhi)
-# define CTX_MDLO(ctx)	((ctx)->sc_mdlo)
-# define REG_HEX_SIZE	8
-#else
-# define CTX_TYPE	ucontext_t *
-# define CTX_REG(ctx, i)	((ctx)->uc_mcontext.gregs[(i)])
-# define CTX_PC(ctx)	((ctx)->uc_mcontext.pc)
-# define CTX_MDHI(ctx)	((ctx)->uc_mcontext.mdhi)
-# define CTX_MDLO(ctx)	((ctx)->uc_mcontext.mdhi)
-# define REG_HEX_SIZE	16
-#endif
-
-/* We will print the register dump in this format:
-
- R0   XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
- R8   XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
- R16  XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
- R24  XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX
-            pc       lo       hi
-      XXXXXXXX XXXXXXXX XXXXXXXX
- The FPU registers will not be printed.
-*/
-
-static void
-hexvalue (_ITOA_WORD_TYPE value, char *buf, size_t len)
-{
-  char *cp = _itoa_word (value, buf + len, 16, 0);
-  while (cp > buf)
-    *--cp = '0';
-}
-
-static void
-register_dump (int fd, CTX_TYPE ctx)
-{
-  char regs[38][REG_HEX_SIZE];
-  struct iovec iov[38 * 2 + 10];
-  size_t nr = 0;
-  int i;
-
-#define ADD_STRING(str) \
-  iov[nr].iov_base = (char *) str;					      \
-  iov[nr].iov_len = strlen (str);					      \
-  ++nr
-#define ADD_MEM(str, len) \
-  iov[nr].iov_base = str;						      \
-  iov[nr].iov_len = len;						      \
-  ++nr
-
-  /* Generate strings of register contents.  */
-  for (i = 0; i < 32; i++)
-    hexvalue (CTX_REG (ctx, i), regs[i], REG_HEX_SIZE);
-  hexvalue (CTX_PC (ctx), regs[32], REG_HEX_SIZE);
-  hexvalue (CTX_MDHI (ctx), regs[33], REG_HEX_SIZE);
-  hexvalue (CTX_MDLO (ctx), regs[34], REG_HEX_SIZE);
-
-  /* Generate the output.  */
-  ADD_STRING ("Register dump:\n\n R0   ");
-  for (i = 0; i < 8; i++)
-    {
-      ADD_MEM (regs[i], REG_HEX_SIZE);
-      ADD_STRING (" ");
-    }
-  ADD_STRING ("\n R8   ");
-  for (i = 8; i < 16; i++)
-    {
-      ADD_MEM (regs[i], REG_HEX_SIZE);
-      ADD_STRING (" ");
-    }
-  ADD_STRING ("\n R16  ");
-  for (i = 16; i < 24; i++)
-    {
-      ADD_MEM (regs[i], REG_HEX_SIZE);
-      ADD_STRING (" ");
-    }
-  ADD_STRING ("\n R24  ");
-  for (i = 24; i < 32; i++)
-    {
-      ADD_MEM (regs[i], REG_HEX_SIZE);
-      ADD_STRING (" ");
-    }
-  ADD_STRING ("\n            pc       lo       hi\n      ");
-  for (i = 32; i < 35; i++)
-    {
-      ADD_MEM (regs[i], REG_HEX_SIZE);
-      ADD_STRING (" ");
-    }
-  ADD_STRING ("\n");
-
-  /* Write the stuff out.  */
-  writev (fd, iov, nr);
-}
-
-
-#define REGISTER_DUMP register_dump (fd, ctx)